Mount Asama erupted overnight from Wednesday to Thursday. By the same token, the national meteorological agency immediately raised its level of alert by a notch. The alert level is now 3 on a scale of 5. This means that you cannot approach within 4 km of the site of the eruption.

The Karuizawa region under surveillance

Mount Asama is located about 140 km west of Tokyo, not far from the city of Karuizawa . Its most violent eruptions in history date from 1108 and 1783.

Even if the last alert concerning him dates from 2015, he remains one of the most active in Japan. It is currently projecting ash and hot clouds of volcanic gas, nearly 2,000 meters into the sky.

In addition, the agency fears that under the influence of the winds, the neighboring towns of the volcano may be affected by falls of smaller stones and ashes.

So far, no injuries or damage has been reported. The authorities have already evacuated, as a precaution, several people who were camping nearby. They were evacuated to a refuge where they spent the night.

This Thursday morning, volcanic gases continued to be projected into the air but at a “normal” level, told AFP an official of the Japanese meteorological agency. “We are not seeing an increase in activity,” he added.

A volcanic and weather warning system

The Japanese meteorological agency is responsible for weather alerts for tropical cyclones in the northwest Pacific. As such, it is responsible for forecasting the displacement of volcanic ash and other pollutants.

In terms of volcanic activity, it uses an alert scale, on five gradual levels, to indicate danger. From the 3rd th level, the instruction is simple: “do not approach”. As for the fifth level, it involves immediately evacuating the surrounding populations.